r5251: - renamed the nbtd server side structures to have a nbtd_ prefix, to

r5251: - renamed the nbtd server side structures to have a nbtd_ prefix, to
  be consistent with the function names

- added WINS client support to the NBT server. It will do initial WINS
  registration, and WINS refresh, automatically failing over to
  secondary WINS servers and handling multi-homed servers where we need
  to register multiple IPs.

- added support for multi-homed name query replies, which are
  essential for multi-homed registration as the WINS server will query
  us to ensure we have the names when doing the secondary IPs in
  multi-homed registration